Malicious PDF — malware analysis report

Static analysis result for SHA-256 35718ca64d82976b…

MALICIOUS

PDF

34.3 KB Created: 2021-07-07 22:13:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 709265cc8a1281ddbaa4b23f50b7deb1 SHA-1: bd0a8fbd25c64a5e2127c26ae86938b3cc0f474c SHA-256: 35718ca64d82976bd24ac0902d208656a66f6867549b88e62abb54d87d28f520
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous external links, many of which are SEO-optimized and point to websites promising free Robux or other game-related items. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of such links, suggesting a link farm designed to attract users with deceptive offers. The ML classifier also strongly flagged this PDF as malicious, supporting the conclusion that it is part of a scam or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://netcdn.tw/app/431946152/websites-to-get-free-robux-game-hack
    • http://www.3d-gold.com.hk/upload/files/how-to-get-free-robux-without-offers_GM431946152.pdf
    • http://www.3d-gold.com.hk/upload/files/can-i-get-free-robux_GM431946152.pdf
    • http://www.3d-gold.com.hk/upload/files/minecraft-free-download-iphone_GM479516143.pdf
    • http://www.3d-gold.com.hk/upload/files/free-ways-to-get-xbox-only-things-on-roblox_GM431946152.pdf
    • http://www.3d-gold.com.hk/upload/files/how-to-get-free-coins-in-minecraft_GM479516143.pdf
    • http://www.3d-gold.com.hk/upload/files/free-spins-coin-master-links_GM406889139.pdf
    • http://www.3d-gold.com.hk/upload/files/haktuts-coin-master-spins_GM406889139.pdf
    • http://www.3d-gold.com.hk/upload/files/tiktok-free-beer-for-a-year_GM835599320.pdf
    • http://www.3d-gold.com.hk/upload/files/roblox-free-download-ps4_GM431946152.pdf
    • http://www.3d-gold.com.hk/upload/files/roblox-rubux-cheat_GM431946152.pdf
    • http://www.3d-gold.com.hk/upload/files/coin-master-free-coins-today_GM406889139.pdf
    • http://www.3d-gold.com.hk/upload/files/tiktok-likes-free_GM835599320.pdf
    • http://www.3d-gold.com.hk/upload/files/roblox-heroes-online_GM431946152.pdf
    • http://www.3d-gold.com.hk/upload/files/free-spins-on-coin-master-link_GM406889139.pdf
    • http://www.3d-gold.com.hk/upload/files/free-coins-in-assassin-roblox_GM431946152.pdf
    • http://www.3d-gold.com.hk/upload/files/free-roblox-accounts-2021-april_GM431946152.pdf
    • http://www.3d-gold.com.hk/upload/files/how-to-make-own-roblox-shirt-free_GM431946152.pdf
    • http://www.3d-gold.com.hk/upload/files/free-obc-for-roblox-august-2021_GM431946152.pdf
    • http://www.3d-gold.com.hk/upload/files/free-limiteds-roblox_GM431946152.pdf
    • http://www.3d-gold.com.hk/upload/files/daily-free-spins-for-coin-master_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002d0f.bin
01ee062c5600047182546d036b3f6c2d965acb9fd0af4465a9c4324235d28936
pdf-font-stream PDF embedded font (sfnt) at offset 0x2D0F 22816 bytes
font_01_sfnt_off0000607b.bin
1ff3ead325db6faa7b931a8562dea2485ede573d321a491f501e33267cef6888
pdf-font-stream PDF embedded font (sfnt) at offset 0x607B 19136 bytes